Deuteronomy 6:13

But the Lord is long-suffering, and does not reduce to nothing him who in his ignorance dares [to utter] such words, but meekly replies, “Get thee hence, Satan.” He does not say, “Get thee behind Me ,” for it is not possible that he should be converted; but, “Begone, Satan,” to the course which thou hast chosen. “Begone” to those things to which, through thy malevolence, thou hast been called. For I know Who I am, and by Whom I have been sent, and Whom it behoves Me to worship. For “thou shall worship the Lord thy God, and Him only shalt thou serve.” I know the one [God]; I am acquainted with the only [Lord] from whom thou hast become an apostate. I am not an enemy of God; I acknowledge His pre-eminence; I know the Father, who is the author of my generation.

1. Thus then does the Lord plainly show that it was the true Lord and the one God who had been set forth by the law; for Him whom the law proclaimed as God, the same did Christ point out as the Father, whom also it behoves the disciples of Christ alone to serve. By means of the statements of the law, He put our adversary to utter confusion; and the law directs us to praise God the Creator ( Demiurgum ), and to serve Him alone. Since this is the case, we must not seek for another Father besides Him, or above Him, since there is one God who justifies the circumcision by faith, and the uncircumcision through faith. For if there were any other perfect Father above Him, He (Christ) would by no means have overthrown Satan by means of His words and commandments. For one ignorance cannot be done away with by means of another ignorance, any more than one defect by another defect. …

As, then, this act of self-restraint, which in appearance is one and the same, is found in fact to be different in different persons, according to the principles and motives which lead to it; so in the same way with those who cannot allow in the worship of the Divine Being altars, or temples, or images. The Scythians, the Nomadic Libyans, the godless Seres, and the Persians, agree in this with the Christians and Jews, but they are actuated by very different principles. For none of these former abhor altars and images on the ground that they are afraid of degrading the worship of God, and reducing it to the worship of material things wrought by the hands of men. …

7. These things were before declared to us, and predicted. But we, forgetful of the law and obedience required of us, have so acted by our sins, that while we despise the Lord’s commandments, we have come by severer remedies to the correction of our sin and probation of our faith. Nor indeed have we at last been converted to the fear of the Lord, so as to undergo patiently and courageously this our correction and divine proof. Immediately at the first words of the threatening foe, the greatest number of the brethren betrayed their faith, and were cast down, not by the onset of persecution, but cast themselves down by voluntary lapse. …

6. In fine, listen to Himself speaking; Himself with a divine voice at once instructing and warning us: “Thou shalt worship the Lord thy God,” says He, “and Him only shalt thou serve.” And again, “Thou shalt have none other gods but me.” And again, “Go not after other gods, to serve them; and worship them not, and provoke not me to anger with the works of your hands to destroy you.” Moreover, the prophet, filled with the Holy Spirit, attests and denounces the anger of God, saying, “Thus saith the Lord Almighty: Because of mine house that is waste, and ye run every man to his own house, therefore the heavens shall be stayed from dew, and the earth shall withhold her fruits: and I will bring a sword upon the earth, and upon the corn, and upon the wine, and upon the oil, and upon men, and upon cattle, and upon all the labours of their hands.” Moreover, another prophet repeats, and says, “An …

“As it is written, Thou shalt worship the Lord thy God, and Him only shalt thou serve.” Also in Exodus: “Thou shalt have none other gods beside me.” Also in Deuteronomy: “See ye, see ye that I am He, and that there is no God beside me. I will kill, and will make alive; I will smite, and I will heal; and there is none who can deliver out of mine hands.” In the Apocalypse, moreover: “And I saw another angel fly in the midst of heaven, having the everlasting Gospel to preach over the earth, and over all nations, and tribes, and tongues, and peoples, saying with a loud voice, Fear God rather, and give glory to Him: for the hour of His judgment is come; and worship Him that made heaven and earth, and the sea, and all that therein is.” So also the Lord, in His Gospel, makes mention of the first and second commandment, saying, “Hear, O Israel, The Lord thy God is one God;” and, “Thou shalt love …

In Jeremiah: “Let not the wise man glory in his wisdom, neither let the strong man glory in his strength, nor let the rich man glory in his riches; but let him that glorieth glory in this, that he understands and knows that I am the Lord, who do mercy, and judgment, and righteousness upon the earth, because in them is my pleasure, saith the Lord.” Of the same thing in the fifty-fourth Psalm: “In the Lord have I hoped; I will not fear what man can do unto me.” Also in the same place: “To none but God alone is my soul subjected.” Also in the cxviith Psalm: “I will not fear what man can do unto me; the Lord is my helper.” Also in the same place: “It is good to trust in the Lord rather than to trust in man; it is good to hope in the Lord rather than to hope in princes.” Of this same thing in Daniel: “But Shadrach, Meshach, and Abednego answered and said to king Nebuchadnezzar, O king, there …

13. Similar evidence has been collected also concerning the Holy Spirit, of which those who have discussed the subject before ourselves have most fully availed themselves, that He too is God, and not a creature. But if not a creature, then not only God (for men likewise are called gods), but also very God; and therefore absolutely equal with the Father and the Son, and in the unity of the Trinity consubstantial and co-eternal. But that the Holy Spirit is not a creature is made quite plain by that passage above all others, where we are commanded not to serve the creature, but the Creator; not in the sense in which we are commanded to “serve” one another by love, which is in Greek δουλεύειν , but in that in which God alone is served, which is in Greek λατρεύειν . From whence they are called idolaters who tender that service to images which is due to God. …

19. Likewise, also, in that which is written, “Now the Lord had said unto Abraham, Get thee out of thy country, and from thy kindred, and thy father’s house,” it is not clear whether a voice alone came to the ears of Abraham, or whether anything also appeared to his eyes. But a little while after, it is somewhat more clearly said, “And the Lord appeared unto Abraham, and said, Unto thy seed will I give this land.” But neither there is it expressly said in what form God appeared to him, or whether the Father, or the Son, or the Holy Spirit appeared to him. Unless, perhaps, they think that it was the Son who appeared to Abraham, because it is not written, God appeared to him, but “the Lord appeared to him.” For the Son seems to be called the Lord as though the name was appropriated to Him; as e.g. …

44. What of justice that pertains to God? As the Lord says, "Ye cannot serve two masters," and the apostle denounces those who serve the creature rather than the Creator, was it not said before in the Old Testament, "Thou shalt worship the Lord thy God, and Him only shalt thou serve?" I need say no more on this, for these books are full of such passages. The lover, then, whom we are describing, will get from justice this rule of life, that he must with perfect readiness serve the God whom he loves, the highest good, the highest wisdom, the highest peace; and as regards all other things, must either rule them as subject to himself, or treat them with a view to their subjection. This rule of life, is, as we have shown, confirmed by the authority of both Testaments.

8. “O magnify the Lord our God” ( ver. 5 ). Magnify Him truly, magnify Him well. Let us praise Him, let us magnify Him who hath wrought the very righteousness which we have; who wrought it in us, Himself. For who but He who justified us, wrought righteousness in us? For of Christ it is said, “who justifieth the ungodly.”…“And fall down before His footstool: for He is holy.” What are we to fall down before? His footstool. What is under the feet is called a footstool, in Greek ὑποπόδιον , in Latin Scabellum or Suppedaneum. But consider, brethren, what he commandeth us to fall down before. …

Has then the divine teaching, which abolished the godlessness of the heathen or the idols, passed over in silence, and left the race of mankind to go entirely unprovided with the knowledge of God? Not so: rather it anticipates their understanding when it says: “Hear, O Israel, the Lord thy God is one God;” and again, “Thou shalt love the Lord thy God with all thy heart and with all thy strength;” and again, “Thou shalt worship the Lord thy God, and Him only shalt thou serve, and shalt cleave to Him.” 2. But that the providence and ordering power of the Word also, over all and toward all, is attested by all inspired Scripture, this passage suffices to confirm our argument, where men who speak of God say: “Thou hast laid the foundation of the earth and it abideth. …